Say three times:
بِسْمِ اللَّهِ
Pronunciation
Bismillaah
Meaning
In the Name of Allah. (3 Times)
Source: Muslim: 2202, Sahih (Albani). Abu Dawud: 3891
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset